If the water level is set too high water will leak down into the overflow tube and cause the fill valve to turn on.
American standard fill valve adjustment.
If the water level is too low turn the dial to the left 1 2 rotations.
Begin by turning off the water supply.
Flush the toilet and check the water level in the tank.
If not slightly adjust the screw to make sure the hook is engaged.
Squeeze the clips on the level adjustment rod and slide the clip down the rod to lower the water level on the fill valve.
There could be problems with the fill valve leading to ghost flushing.
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Take the cover of the tank off and inspect the top of your fill valve for a dial or switch.
Lift off the toilet tank lid and set it aside.
Here is a brief but helpful american standard dual flush toilet troubleshooting guide.
Turn the screw clockwise to raise the float at the end of the arm.
The lever of the tank may not return to its normal or original position after you have used it.
In american standard toilets floats are attached to the valve that controls how much water refills the toilet.
This may resolve fill issues.
This style of fill valve in.
Locate the fill valve on the left side of the tank.
Turn adjustment screw clockwise or counterclockwise turn an adjustment screw located on the top of the valve.
Watch water level the water level must be below the top of the tank s overflow tube.
Turn the dial on top of the fill valve if you have a newer model.
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Place a flat head screwdriver into the adjustment screw on the top of the fill valve.
Then drain the tank by holding down the handle or lifting the valve chain inside the tank.
The lever may get stuck in flushed down or upward position instead of being horizontal.
Depress the trip lever all the way make sure the hook is fully engaged under the tab on the valve body.
If the water level is too high turn the dial to the right 1 2 rotations.
You can adjust the float by adjusting a screw or moving a rod in many toilets.